Consider the following facts: The ionization equilibrium of an acid (e.g., COOH

Question

Consider the following facts: The ionization equilibrium of an acid (e.g., COOH group of an amino acid) is described by the following equation: HA leftarrow rightarrow H^+ + A^- ("A" stands for a proton acceptor) K is equilibrium constant for ionization (de-protonation) of an acid, defined as K = [H^+] [A^-] / [HA]; "p" means "negative log_10 ", e.g., pH = - log_10[H^+]. Based on facts 1-3 listed above, obtain a definition of pK of an acid in a form of equation that relates the pK to the pH of the solution where ionization of the acid occurs. Explain the meaning of this equation.

Explanation / Answer

pKa of an acid

relating pKa and pH

pKa = -log(Ka)

Ka = [H+][A-]/[HA-]

then

pKa = -log([H+][A-]/[HA-])

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